<http://schema.org/position>
"1"^^<http://www.w3.org/2001/XMLSchema#integer>
<http://product.rakuten.co.jp/product/SONY+SRS-X2%28B%29/6f629f5e0a03fb57cbe09a6028e5b5ff/summary/1/?sc=2&l2-id=pdt_filter_asuraku>